MECHANICAL PROBLEMS
Possible causes of insufficient heat due to mechanical problems are as follows
- Obstructed cowl air intake
- Obstructed heater system outlets
- Inoperative engine thermostat
- Inoperative blower motor system
- Inoperative A/C-heater control
- Inoperative blend door actuator(s)
- Inoperative, obstructed or improperly installed blend-air door(s)